I’m willing to argue that “Scream” is the greatest slasher movie franchise of all time. Not only is the 1996 original a meta-horror classic, but prior to “Scream VI,” three of the five movies in the series were halfway decent. Can any other slasher property with at least five installments boast that kind of ratio of good to bad? “A Nightmare on Elm Street” got too silly with jokes that didn’t land, “Friday the 13th” was overrated in the first place, and fans got sick of “Halloween” constantly reinventing itself. “Scream” has thus far needed only one clear reboot, and last year’s fifth installment was a rousing success. A mere fourteen months later, we’ve got a sixth chapter, and it… keeps the property out of trouble.